Apparatus for preventing carbon deposit during box annealing



Jan. 28, 1941.

S. .H. BOBROV -APPA.RATUS FOR PREVENTING CARBON DEPOSITDURING BOX ANNEALING Filed Feb. 23, 1959 PIE. 1.

Patented Jan. 28, 1941 z ggl PAT OFFICE APPARATUS- FOR PREVENTING CARBON DEPOSIT DURING BOX ANNEALING 1 Claim.

The present invention relates to apparatus for preventing deposition of carbon during box annealing of cold reduced deoxidized sheets and the like. T

An object of this invention is to provide a gaseous atmosphere having characteristic properties which will prevent carbon deposit upon the material being annealed,

Other objects and advantages will become apparent as the description proceeds and reference is had to the accompanying drawing, in which:

Figure 1 is a plan of the base of an annealing box with the cover removed and showing the present invention applied thereto;

Figure 2 is a section on line IIII of Figure 1;

Figure 3 is a section on line III-III of Figure l; and

Figure 4 is an enlarged detailed transverse section through the gas supply pipe showing the steel shavings for purifying the gases passing therethrough.

In the drawing, the numeral 2 represents the supporting base of a conventional type annealing box upon which is positioned, in the conventional manner, the'inner cover 3 and the outer heatresisting cover 4, each of which is of conven tional design.

Supported upon the base 2, in spaced relation thereto, is a base plate 5, provided with cut-out portions 6 and I. This afiords ready access to the pipe "connections which supply the purified gaseous atmosphere to the interior of the an-' nealing box so that carbon deposits upon the material being annealed is prevented.

Whatever compound or combinations thereof contribute most to the deposition of carbon within the annealing box, its formation in all cases is brought about by the application of heat to the total components which comprise the final gas mixture. Therefore, heat may be considered as a cleaning agent which precipitates the carbon from its original gas mixture and subsequently supplies a gas which will not further precipitate carbon at the same temperature.

A pipe 8 havingapproximately 2 inches in inside diameter and approximately 80 inches in length, is positioned diagonally beneath theibase plate 5, as indicated in Figure l and connected on one end to the main gas supply line 9. This pipe 8 is loosely packed with clean steel shavings l0, said shavings being preferably pre-cleaned by v passing'them through a bright annealing furnace on a rider sheet. There is a transfer of heat from the base to the pipe so that gas supplied from the main supply pipe 9 will be reacted upon by such heat so as to precipitate the carbon therefrom, if any, on the steel shavings within the pipe before entering the main annealing chamber as purified gas.

Mounted upon one end of said pipe 8, is a union elbow l 2, which establishes a connection between said pipe and the main gas line 9, while on the other end of said pipe 8 is secured a T l3. This T is provided with an outlet it so that the purified gases may pass into the interior of the annealing box, while a plug I5 is secured to the end of the T. When it is desired to clean the pipe 8, the union elbow l2 and T l3 are removed, and the steel shavings containing the carbon deposits are forced through the pipe by any suitable device.

After the pipe 8 has been cleaned, clean steel shavings are positioned within said pipe, the union elbow and T secured in place, and the gas again introduced through the pipe 9 so that it will become filtered or purified as it passes through the steel shavings in order that it will be free from 7 carbon when it enters the interior of the annealing box through outlet M. A pipe I6 extends into the interior of the annealing box in order to permit the gases to escape and relieve pressure withinthe annealing box.

While I have shown and described a specific embodiment of the present invention, itwill be i In combination with an annealing box comprisa ing a base, a rectangular material-supporting base plate positioned on the box base, said box base and said base plate being of rectangular form, a pipe disposed diagonally of the sides and ends of said base plate and located within the annealing box between said supporting plate and said annealing box base, means for supplying gas to said pipe, finely divided metal particles within said pipe for precipitating solids from the gas passing therethrough, a detachable connection between said pipe and said gas supplying means, said supporting base plate having a notched portion opposite the detachableconnection whereby ready access may be had thereto to facilitate detachment of the pipe for cleaning.

SAMUEL H. BOBROV. 

